Effect of Melting Conditions on Chromium-Nickel Alloy Kh20N80 Properties

Resumo

Physical properties of alloy Kh20N80 in a liquid state are studied. Critical temperatures are established above which heating makes it possible to transfer melt into a micro-homogeneous equilibrium state. A timetemperature regime for liquid metal treatment is proposed and tested in industrial conditions. The use of this regime leads to a change in ingot zonal structure and more uniform distribution of alloy property values over its cross-section. At hot plastic deformation temperatures, there is a significant increase in alloy relative elongation (by 15–20%), and in this case strength properties and relative reduction of area are unchanged. In test metal, after deformation there is an increase in density and specific electrical resistance that points to increased alloy uniformity. The yield of metal after hot plastic deformation as a result of TTT increases from 66.8 to 72.3%.